Liquid soap personal cleanser with critical heat cycle stabilizing system

Abstract

The present invention relates to a stable dispersoidal liquid soap cleansing composition comprising: (A) from about 5% to about 20% by weight of potassium fatty acid soap; (B) from about 2.5% to about 18% C8-C22 free fatty acid; (C) from about 55% to about 90% water; and (D) from about 0.1% to about 4% of a stabilizer selected from the group consisting of: from about 0.1% to about 3.0% of an electrolyte; and from 0% to about 2.0% of a polymeric thickener; and mixtures thereof; and wherein said fatty acid of said (A) and (B) has an Iodine Value of from zero to about 15; and a titer of from about 44 to about 70; wherein said soap and said free fatty acid have a weight ratio of about 1:0.3 to about 1:1; and wherein said liquid has an initial viscosity of from about 4,000 cps to about 100,000 cps at 25 degrees C. and a Cycle Viscosity of from about 10,000 cps to about 100,000 cps at 25 degrees C.

What is claimed is: 
     
       1. A very mild dispersoidal liquid soap personal cleansing composition comprising: (A) from about 5% to about 20% by weight of potassium fatty acid soap;   (B) from about 2.5% to about 18% C 8  -C 2 .sbsb.2 free fatty acid;   (C) from about 55% to about 90% water; and   (D) from about 0.1% to about 4% of a stabilizer selected from the group consisting of: from about 0.1% to about 3.0% of an electrolyte; and from 0% to about 2.0% of a polymeric thickener; and mixtures thereof; and   wherein said fatty acid of (A) and (B) has an Iodine Value of from zero to about 15; and a titer (° C.) of from about 44 to about 70;   wherein said soap and said free fatty acid have a weight ratio of about 1:0.3 to about 1:1; and   wherein said liquid has an initial viscosity of from about 4,000 cps to about 100,000 cps at 25° C. and a Cycle Viscosity of from about 10,000 cps to about 100,000 cps at 25° C.;   wherein said composition is made by the following steps:   
     
     
       1. heating and mixing an aqueous mixture of potassium fatty acid soap and free fatty acid to provide a stable melt; 2. cooling the melt to about room temperature; and   3. diluting said cooled melt with water to provide said dispersoidal liquid; wherein said composition is contained in a container having a pressure actuated pump.   
     
     
       2. A liquid cleansing composition of claim 1 wherein said composition contains from about 0.3% to about 1.5%, of said electrolyte which is selected from the group consisting of potassium chloride, potassium acetate and an equivalent molar concentration of any other water-soluble single charge electrolyte, and mixtures thereof; and from about 0.1% to about 1% of said thickener; and wherein said Iodine Value is less than 10 and said titer is from about 50 to about 70 and wherein said liquid has an initial 10,000 cps to about 70,000 cps and a Cycle Viscosity of from about 15,000 cps to about 90,000 cps. 
     
     
       3. A liquid cleansing composition of claim I wherein said composition contains an electrolyte at a level of about 1.4% and is selected from the group consisting of potassium chloride, potassium acetate and an equivalent molar concentration of any other water-soluble single charge electrolyte, and mixtures thereof; and wherein said Iodine Value is less than 3 and said titer is from about 62 to about 70. 
     
     
       4. A liquid cleansing composition according to claim 1 comprising from about 6% to about 14% by weight of said potassium soap and from about 3% to about 9% by weight of said free fatty acid; and wherein said liquid composition has an initial viscosity of from about 10,000 to about 70,000 cps and a Cycle Viscosity of from about 25,000 cps to about 80,000 cps. 
     
     
       5. A liquid cleansing composition according to claim 1 comprising from about 1% to about 10% of a high lathering synthetic surfactant. 
     
     
       6. A liquid cleansing composition according to claim 1 wherein the ratio of potassium soap to free fatty acid is from about 1:0.3 to about 1:0.8; and wherein said fatty acid is highly saturated and has an Iodine Value of from zero to about 10; and wherein said fatty acid is composed of alkyl chain lengths ranging from C 8  to C 22;  and wherein said fatty acid has a titer of from about 62 to about 70, and wherein said composition contains from about 2% to about 6% of a higher lathering synthetic surfactant. 
     
     
       7. A liquid cleansing composition according to claim 6 wherein said fatty acid has an Iodine Value of from zero to 3 and wherein said synthetic surfactant is lauroyl sarcosinate with cations selected from sodium or potassium, and mixtures thereof. 
     
     
       8. A liquid cleansing composition according to claim 1 wherein said composition has a shear thinning factor of at least 1.5 up to about 25. 
     
     
       9. A liquid cleansing composition according to claim 8 wherein said factor is from about 2 to about 20. 
     
     
       10. A liquid cleansing composition according to claim 8 wherein said shear thinning factor is from about 3 to about 15. 
     
     
       11. A liquid cleansing composition according to claim 1 wherein said fatty acid is composed of chain lengths ranging from C 12  to C 18 . 
     
     
       12. A liquid cleansing composition according to claim 1 wherein said composition contains from about 60% to about 80% water; from about 6% to about 14% said potassium fatty acid soap; from about 3% to about 9% said free fatty acid; and wherein said fatty acid has an Iodine Value of from zero to 3 and wherein said viscosity is from about 10,000 cps to about 70,000 cps. 
     
     
       13. A liquid cleansing composition according to claim 1 wherein said liquid composition has a shear thinning factor of from about 2 to about 10. 
     
     
       14. The method of claim 1 wherein said cooled melt of Step 2 is stable. 
     
     
       15. The method of claim 1 wherein said soap and said free fatty acid of Step 1 are heated to a temperature of from about 75° C. to about 90° C. 
     
     
       16. The method of claim 1 wherein said method includes deaeration of said liquid. 
     
     
       17. The method of claim 1 wherein said cooling is conducted at a rate of about 0.5° C. per minute or slower.